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Homozygous mutations in the human ATM gene lead to a pleiotropic clinical phenotype of ataxia-telangiectasia (A-T) patients and correlating cellular deficiencies in cells derived from A-T donors. Saccharomyces cerevisiae tel1 mutants lacking Tel1p, which is the closest sequence homologue to the ATM protein, share some of the cellular defects with A-T. Through genetic complementation of A-T cells with the yeast TEL1 gene, we provide evidence that Tel1p can partially compensate for ATM in suppressing hyperrecombination, radiation-induced apoptosis, and telomere shortening. Complementation appears to be independent of p53 activation. The data provided suggest that TEL1 is a functional homologue of human ATM in yeast, and they help to elucidate different cellular and biochemical pathways in human cells regulated by the ATM protein.

molecular biology of the cell

The Yeast<i>TEL1</i>Gene Partially Substitutes for Human<i>ATM</i>in Suppressing Hyperrecombination, Radiation-Induced Apoptosis and Telomere Shortening in A-T Cells

The YeastTEL1Gene Partially Substitutes for HumanATMin Suppressing Hyperrecombination, Radiation-Induced Apoptosis and Telomere Shortening in A-T Cells